若氨水的质量摩尔浓度为m(mol/kg ),则溶质氨的摩尔分数为?
A: [img=26x46]1803409a009572d.png[/img]
B: [img=97x46]1803409a090bc24.png[/img]
C: [img=63x46]1803409a1102b59.png[/img]
D: [img=109x44]1803409a1956207.png[/img]
A: [img=26x46]1803409a009572d.png[/img]
B: [img=97x46]1803409a090bc24.png[/img]
C: [img=63x46]1803409a1102b59.png[/img]
D: [img=109x44]1803409a1956207.png[/img]
举一反三
- 若X为随机变量,则D(X)为 A: [img=110x46]1803e0aa1d7387d.png[/img] B: [img=133x58]1803e0aa299766b.png[/img] C: [img=227x56]1803e0aa35a24e1.png[/img] D: [img=245x46]1803e0aa4214414.png[/img]
- 在质量摩尔浓度为1.0mol/kg NaCl水溶液中,溶质的摩尔分数[img=15x15]17e0bedf2a7c1c3.jpg[/img]为()。 A: 1.00 B: 0.055 C: 0.0177 D: 0.180
- 设氨水的解离平衡常数为[img=36x38]18033f74304a00f.png[/img]。浓度为m mol·kg-1的氨水溶液,若将其用水稀释一倍,则溶液中OH-的浓度为( )mol·kg -1 A: [img=44x62]18033f743b6adbf.png[/img] B: [img=106x62]18033f74485512c.png[/img] C: [img=112x46]18033f7455ab101.png[/img] D: 2m
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]1802f2c16f96412.png[/img] A: D(X) B: 1 C: [img=58x66]1802f2c17877038.png[/img] D: a 2D(X)
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]1802f2c2b6e46d0.png[/img] A: D(X) B: 1 C: [img=58x66]1802f2c2bf3c80f.png[/img] D: a 2D(X)